Code Review fix for 6799919 Recursive calls to report_vm_out_of_memory are handled incorrectly (original) (raw)

Coleen Phillimore coleen.phillimore at oracle.com
Wed Feb 20 09:37:55 PST 2013

On 2/20/2013 12:05 PM, Daniel D. Daugherty wrote:

On 2/20/13 9:57 AM, Daniel D. Daugherty wrote:

On 2/20/13 9:34 AM, Coleen Phillimore wrote:

This looks good. Thanks for the review! Don't know if Ron is having the same connectivity problems I'm having this morning, but my access into OWAN is going up and down...

It looks like the webrev was updated to get rid of the unused variable, so that is good. The webrev was not updated.

Yes, I see that now. Mikael has a much better eye than I do.

Is there a test for ErrorHandlerTest in our repository already? ErrorHandlerTest? Is there yet another possible test that we don't know about? OK. I know that test by a different name: $ rgrep ErrorHandlerTest agent make src test src/share/vm/runtime/globals.hpp: notproduct(uintx, ErrorHandlerTest, _0, _ src/share/vm/prims/jni.cpp: NOTPRODUCT(testerrorhandler(ErrorHandlerTest)); test/runtime/6888954/vmerrors.sh: -XX:ErrorHandlerTest=${i} -version > ${i2}.out 2>&1 test/runtime/6888954/vmerrors.sh: # If ErrorHandlerTest is ignored (product build), stop. test/runtime/6888954/vmerrors.sh: echo "ErrorHandlerTest=$i failed ($f)" Ron had previously explored using vmerror.sh to exercise the vmexitoutofmemory() code path as one of his early experiments. He also did some testing using the ErrorHandlerTest command line option. In neither case did it seem possible to get multi-threaded test cases up and running. Perhaps both he and I missed something. It also looks like Ron didn't record the specifics of his testing with either vmerrors.sh or the ErrorHandlerTest command line option in the bug report. I'll have to rattle his cage about that.

My question was mostly if we had a jtreg test in hotspot/test repository that exercised this ErrorHandlerTest option. The second part of the question is whether we should have a test because it'll look like it failed. Maybe this is more of a question for Christian Tornqvist and SQE and is not tied to this specific change.

I talked to Ron about trying to test this also and we couldn't come up with a good strategy either. We need a good way to test out of C heap memory without actually allocating lots of memory and running out of C heap. Such tests don't run well. Maybe we can do something in the future with this ErrorHandlerTest option to have the VM return NULL or assert for various malloc calls triggered through some heuristic.
Having the experiments to date recorded somewhere would be great.

Thanks, Coleen

Dan

Dan

Thanks, Coleen On 2/19/2013 6:48 PM, Daniel D. Daugherty wrote: Greetings, I'm sponsoring this code review request from Ron Durbin. This change is targeted at JDK8/HSX-25 in the RTBaseline repo. Dan

I have a proposed fix for the following bug: 6799919 Recursive calls to reportvmoutofmemory are handled incorrectly http://bugs.sun.com/bugdatabase/viewbug.do?bugid=6799919 https://jbs.oracle.com/bugs/browse/JDK-6799919 This is one of those bug fixes where the commit message nicely describes the change: 6799919: Recursive calls to reportvmoutofmemory are handled incorrectly Summary: reportvmoutofmemory() should allow VMError.reportanddie() to handle multiple out of native memory errors. Reviewed-by: dcubed, Contributed-by ron.durbin at oracle.com Here is the webrev URL: http://cr.openjdk.java.net/~dcubed/forrdurbin/6799919-webrev/0-hsx25 Testing: - See the README file attached to the JDK-6799919 for the gory details of the testing needed to reproduce this failure and verify the fix - regular JPRT test job is in process Comments, questions and suggestions are welcome. Ron

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